I'm afraid I agree. In signing for us whilst knowing this was going on, he's shown massive disrespect by not telling us,

Obviously that all depends on whether he knew whether this investigation was happening when he signed for us. If he didn't (and I honestly don't know-I'm not sure of the timeline of events) then the least you can say, imo, is that he knew he had a problem but didn't think to tell us.

And yes, I know that folk aren't generally inclined to shoot themselves in the foot on purpose, but that in itself doesn't detract from the fact that he's basically lied to us when he signed. And it's hard to argue that that's not disrespectful.